Accretion definition, an increase by natural growth or by gradual external addition; growth in size or extent. See more.
Alveoli are tiny sacs within our lungs that allow oxygen and carbon dioxide to move between the lungs and bloodstream. Learn more about how they function and quiz your knowledge at the end.
the alveoli are the primary gas exchange units of the lung quite simply they are the point where the gas blood barrier is thin enough to permit rapid gas exchange to get into the blood oxygen is diffused through the alveolar epithelium a thin interstitial space and the capillary endotheliumhe alveoli are the primary gas exchange units of the lung quite simply they are the point where the gas blood barrier is thin enough to permit rapid gas exchange to get into the blood oxygen is diffused through the alveolar epithelium a thin interstitial space and the capillary endothelium